well.... it looks a LITTLE better than mine. you might want to go with 8 GB of memory though for some headroom, 5x wows tends to eat it up. What OS you planning on?
also, you can't really judge the fps solely by specs. i can tell you that i run my main at 1680x1050, 4 slaves 800x600, with maxfps 45, maxfpsbk 15 and that works out really well.

edit: just noticed you have a dual-core cpu listed... mine is a quad core 2.83 GHZ so i can't really tell you exactly what to expect on that front, you should be ok though